I have a similar issue, and it's happened across 3 transmissions on the same truck. I bought a used 2005 Lariat (160k+), and noticed over time that it would "jolt" hard when downshifting at high speeds. Almost a hard knock. Fast forward two years later, and my engine implodes while towing a trailer up a hill, so I ended up having to replace it. I had them also replace the transmission while they had it apart (figured better safe than sorry, and would be cheaper to do now than later). Annoyingly, the new transmission would also shift real hard when going into a passing gear. If I was doing 6o-ish and I stepped on it (you know...to pass), it would slam real hard on the downshift. A little over a year later an unrelated issue came to light with this 2nd transmission, and they ended up making a warranty replacement. The new (3rd) transmission does the same thing as the previous two. And all three only ever did it when downshifting at speed (passing). What are the odds? Is it a PCB thing? Vacuum? I don't think I can blame the transmission itself anymore, and I would assume fluids would have been checked/replaced each time. Any thoughts?
Thanks
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Unfortunately there are many idiots to call themselves transmission rebuilders and I would say that those guys just don't know what the hell they're doing rebuilding them. Because that symptom is a worn out transmission or one that was not rebuilt truck it's exactly how those things go bad. I know when I was with the clowns are doing she said I've seen guys just get junkyard engine once throw him in and spray paint them I seen all kinds of scams and a lot of them are just idiots that don't know what they're doing
